Existence and stability of propagating fronts for an autocatalytic reaction-diffusion system |
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Authors: | S Focant and Th Gallay |
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Institution: | a Physique Théorique, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgique b Analyse Numérique et EDP, Université de Paris XI, F-91405, Orsay Cedex, France |
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Abstract: | We study a one-dimensional reaction-diffusion system which describes an isothermal autocatalytic chemical reaction involving both a quadratic (A + B → 2B) and a cubic (A + 2B → 3B) autocatalysis. The parameters of this system are in the ratio D = DB/DA of the diffusion constants of the reactant A and the autocatalyst B, and the relative activity k of the cubic reaction. First, for all values of D > 0 and k ≥ 0, we prove the existence of a family of propagating fronts (or travelling waves) describing the advance of the reaction. In particular, in the quadratic case k = 0, we recover the results of Billingham and Needham Phil. Trans. R. Soc. London A 334 (1991) 1–24]. Then, if D is close to 1 and k is sufficiently small, we prove using energy functionals that these propagating fronts are stable against small perturbations in exponentially weighted Sobolev spaces. This extends part of the results that are known for the scalar equation to which our system reduces when D = 1. |
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Keywords: | Reaction-diffusion equations Fronts Travelling waves Stability |
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